Apparatus and method for transmitting control information in communication system

ABSTRACT

The disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as long term evolution (LTE). An operating method of a user equipment (UE) in a communication system includes performing radio resource control (RRC) signaling with a base station, determining a code rate based on an RRC configuration according to the RRC signaling, and determining a size of data using the code rate.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a 371 National Stage of International ApplicationNo. PCT/KR2018/014088, filed Nov. 16, 2018, which claims priority toKorean Patent Application No. 10-2017-0154224, filed Nov. 17, 2017, thedisclosures of which are herein incorporated by reference in theirentirety.

BACKGROUND 1. Field

The present disclosure generally relates to a communication system, andmore specifically, to an apparatus and method for transmitting andreceiving control information in the communication system.

2. Description of Related Art

To satisfy a wireless data traffic demand which is growing after a 4thgeneration (4G) communication system is commercialized, efforts areexerted to develop an advanced 5th generation (5G) communication systemor a pre-5G communication system. For this reason, the 5G communicationsystem or the pre-5G communication system is referred to as a beyond 4Gnetwork communication system or a post long term evolution (LTE) system.

To achieve a high data rate, the 5G communication system considers itsrealization in an extremely high frequency (mmWave) band (e.g., 60 GHzband). To mitigate a path loss of propagation and to extend apropagation distance in the extremely high frequency band, the 5Gcommunication system is discussing beamforming, massive multiple inputmultiple output (MIMO), full dimensional (FD)-MIMO, array antenna,analog beam-forming, and large scale antenna techniques.

Also, for network enhancement of the system, the 5G communication systemis developing techniques such as evolved small cell, advanced smallcell, cloud radio access network (RAN), ultra-dense network, device todevice (D2D) communication, wireless backhaul, moving network,cooperative communication, coordinated multi-points (CoMP), and receiveinterference cancellation.

Besides, the 5G system is working on hybrid frequency shift keying andquadrature amplitude modulation (FOAM) and sliding window superpositioncoding (SWSC) as advanced coding modulation (ACM) schemes, and filterbank multi carrier (FBMC), non orthogonal multiple access (NOMA), andsparse code multiple access (SCMA) as advanced access technologies.

Meanwhile, new radio (NR) which is new 5G communication is designed tofreely multiplex various services in time and frequency resources, andaccordingly waveform/numerology and a reference signal may be allocateddynamically or freely based on need of a corresponding service. Datatransmission optimized through measurement of a channel quality and aninterference amount is important to provide an optimal service to aterminal in the communication, and accordingly accurate channel statemeasurement is essential. However, unlike the 4G communication wherechannel and interference characteristics do not significantly changeaccording to the frequency resource, since channel and interferencecharacteristics in a 5G channel considerably change according to theservice, it is necessary to support a subset in a frequency resourcegroup (FRG) for dividing and measuring them. Meanwhile, the type ofservices supported in the NR system may be divided to categories such asenhanced mobile broadband (eMBB), massive machine type communications(mMTC), ultra-reliable and low-latency communications (URLLC), and soon. The eMBB may be a service aiming for fast transmission ofhigh-capacity data, the mMTC may be a service aiming for terminal powerminimization and access of multiple terminals, and the URLLC may be aservice aiming for high reliability and low delay. Depending on the typeof the service applied to the terminal, different requirements may beapplied.

A plurality of services may be provided to a user in the communicationsystem as above, and what is demanded is a method for providing eachservice for the characteristics within the same time period to providesuch services to the user and an apparatus using the same.

SUMMARY

Based on the discussions described above, the present disclosureprovides an apparatus and a method for generating a channel qualityindicator (CQI) and modulation and coding scheme (MCS) table in awireless communication system requiring various block error rate (BLER)targets.

According to various embodiments of the present disclosure, an operatingmethod of a user equipment (UE) in a communication system includesperforming radio resource control (RRC) signaling with a base station,determining a code rate based on an RRC configuration according to theRRC signaling, and determining a size of data using the code rate.

According to various embodiments of the present disclosure, an apparatusof a UE in a communication system includes a transceiver, and at leastone processor functionally coupled with the transceiver. The at leastone processor performs RRC signaling with a base station, determines acode rate based on an RRC configuration according to the RRC signaling,and determines a size of data using the code rate.

An apparatus and a method according to various embodiments of thepresent disclosure may increase system transmission efficiency andefficiently acquire a transport block size (TBS) using a plurality ofchannel quality indicator (CQI) and modulation and coding scheme (MCS)tables for supporting various scenarios.

Effects obtainable from the present disclosure are not limited to theabove-mentioned effects, and other effects which are not mentioned maybe clearly understood by those skilled in the art of the presentdisclosure through the following descriptions.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a wireless communication system according to variousembodiments of the present disclosure.

FIG. 2 illustrates a configuration of a base station in a wirelesscommunication system according to various embodiments of the presentdisclosure.

FIG. 3 illustrates a configuration of a terminal in a wirelesscommunication system according to various embodiments of the presentdisclosure.

FIGS. 4A through 4C illustrate a configuration of a communication unitin a wireless communication system according to various embodiments ofthe present disclosure.

FIG. 5 illustrates a basic structure of a frequency-time domain which isa wireless resource region for transmitting data or control informationin downlink in a long term evolution (LTE) system according to variousembodiments of the present disclosure.

FIG. 6 illustrates a modulation scheme usable in a wirelesscommunication system according to various embodiments of the presentdisclosure.

FIG. 7 illustrates an example of one channel quality indicator (CQI)transmission of channel state information of a terminal according to asignal energy and an interference level measured by the terminalaccording to various embodiments of the present disclosure.

FIG. 8 illustrates a flowchart of a terminal for calculating a transportblock size (TB S) using a CQI and MCS table according to variousembodiments of the present disclosure.

FIG. 9 illustrates another flowchart of a terminal for calculating a TBSusing a CQI and MCS table according to various embodiments of thepresent disclosure.

DETAILED DESCRIPTION

Terms used in the present disclosure are used for describing particularembodiments and are not intended to limit the scope of otherembodiments. A singular form may include a plurality of forms unless itis explicitly differently represented. All the terms used herein,including technical and scientific terms, may have the same meanings asterms generally understood by those skilled in the art to which thepresent disclosure pertains. Among terms used in the present disclosure,the terms defined in a general dictionary may be interpreted to have thesame or similar meanings with the context of the relevant art, and,unless explicitly defined in this disclosure, it shall not beinterpreted ideally or excessively as formal meanings. In some cases,even terms defined in this disclosure−+should not be interpreted toexclude the embodiments of the present disclosure.

In various embodiments of the present disclosure to be described below,a hardware approach will be described as an example. However, since thevarious embodiments of the present disclosure include a technology usingboth hardware and software, the various embodiments of the presentdisclosure do not exclude a software-based approach.

Hereafter, the present disclosure relates to an apparatus and a methodfor transmitting and receiving control information in a wirelesscommunication system. Specifically, the present disclosure explains atechnique for transmitting and receiving the control information basedon a channel quality indicator (CQI) and modulation and coding scheme(MC S) table in the wireless communication system.

Terms indicating signals, terms indicating channels, terms indicatingcontrol information, terms indicating network entities, and termsindicating components of an apparatus, which are used in the followingdescriptions, are for the sake of explanations. Accordingly, the presentdisclosure is not limited to the terms to be described, and may useother terms having technically identical meaning.

In addition, the present disclosure describes various embodiments usingterms used in some communication standards (e.g., 3rd generationpartnership project (3GPP)), which are merely exemplary forexplanations. Various embodiments of the present disclosure may beeasily modified and applied in other communication systems.

FIG. 1 illustrates a wireless communication system according to variousembodiments of the present disclosure. FIG. 1 depicts a base station110, a terminal 120, and a terminal 130, as some of nodes which use aradio channel in the wireless communication system. While FIG. 1 depictsonly one base station, other base station which is identical or similarto the base station 110 may be further included.

The base station 110 is a network infrastructure for providing radioaccess to the terminals 120 and 130. The base station 110 has coveragedefined as a specific geographical area based on a signal transmissiondistance. The base station 110 may be referred to as, besides the basestation, an access point (AP), an eNodeB (eNB), a 5th generation node(5G node), a wireless point, a transmission/reception point (TRP), orother terms having technically identical meaning.

The terminal 120 and the terminal 130 each are a device used by a user,and communicate with the base station 110 over a radio channel. In somecases, at least one of the terminal 120 and the terminal 130 may operatewithout user's involvement. That is, at least one of the terminal 120and the terminal 130 is a device which performs machine typecommunication (MTC), and may not be carried by the user. The terminal120 and the terminal 130 each may be referred to as, besides theterminal, a user equipment (UE), a mobile station, a subscriber station,a remote terminal, a wireless terminal, a user device, or other termhaving a technically equivalent meaning.

The base station 110, the terminal 120, and the terminal 130 maytransmit and receive radio signals in a millimeter wave (mmWave) band(e.g., 28 GHz, 30 GHz, 38 GHz, 60 GHz). In so doing, to improve channelgain, the base station 110, the terminal 120, and the terminal 130 mayconduct beamforming. Herein, the beamforming may include transmitbeamforming and receive beamforming. That is, the base station 110, theterminal 120, and the terminal 130 may apply directivity to a transmitsignal or a received signal. For doing so, the base station 110 and theterminals 120 and 130 may select serving beams 112, 113, 121, and 131through a beam search or beam management procedure. After the servingbeams 112, 113, 121, and 131 are selected, communications may beperformed using resources which are quasi co-located (QCL) withresources which carry the serving beams 112, 113, 121, and 131.

If large-scale properties of a channel which carries a symbol on a firstantenna port may be inferred from a channel which carries a symbol on asecond antenna port, the first antenna port and the second antenna portmay be said to be QCL. For example, the large-scale properties mayinclude at least one of delay spread, Doppler spread, Doppler shift,average gain, average delay, and spatial receiver parameter.

FIG. 2 illustrates a configuration of a base station in a wirelesscommunication system according to various embodiments of the presentdisclosure. The configuration in FIG. 2 may be understood as theconfiguration of the base station 110. A term such as ‘portion’ or ‘˜er’ used hereafter indicates a unit for processing at least one functionor operation, and may be implemented using hardware, software, or acombination of hardware and software.

Referring to FIG. 2, the base station includes a wireless communicationunit 210, a backhaul communication unit 220, a storage unit 230, and acontrol unit 240.

The wireless communication unit 210 may perform functions fortransmitting and receiving signals over a radio channel. For example,the wireless communication unit 210 performs a conversion functionbetween a baseband signal and a bit string according to a physical layerstandard of the system. For example, in data transmission, the wirelesscommunication unit 210 generates complex symbols by encoding andmodulating a transmit bit string. Also, in data reception, the wirelesscommunication unit 210 restores a receive bit string by demodulating anddecoding a baseband signal.

Also, the wireless communication unit 210 up-converts the basebandsignal to a radio frequency (RF) band signal, transmits it via anantenna, and down-converts an RF band signal received via an antenna toa baseband signal. For doing so, the wireless communication unit 210 mayinclude a transmit filter, a receive filter, an amplifier, a mixer, anoscillator, a digital to analog convertor (DAC), an analog to digitalconvertor (ADC), and so on. In addition, the wireless communication unit210 may include a plurality of transmit and receive paths. Further, thewireless communication unit 210 may include at least one antenna arrayincluding a plurality of antenna elements.

In terms of the hardware, the wireless communication unit 210 mayinclude a digital unit and an analog unit, and the analog unit mayinclude a plurality of sub-units according to an operating power and anoperating frequency. The digital unit may be implemented with at leastone processor (e.g., a digital signal processor (DSP)).

The wireless communication unit 210 transmits and receives the signalsas stated above. Hence, whole or part of the wireless communication unit210 may be referred to as ‘a transmitter’, ‘a receiver’, or ‘atransceiver’. Also, in the following, the transmission and the receptionover the radio channel is used as the meaning which embraces theabove-stated processing of the wireless communication unit 210. In someembodiments, the wireless communication unit 210 may perform functionsfor transmitting and receiving a signal using wired communication.

The backhaul communication unit 220 provides an interface forcommunicating with other nodes in the network. That is, the backhaulcommunication unit 220 converts a bit sting transmitted from the basestation to another node, for example, to another access node, anotherbase station, an upper node, or a core network, to a physical signal,and converts a physical signal received from the other node to a bitstring.

The storage unit 230 stores a basic program for operating the basestation, an application program, and data such as setting information.The storage unit 230 may include a volatile memory, a non-volatilememory, or a combination of a volatile memory and a non-volatile memory.The storage unit 230 provides the stored data at a request of thecontrol unit 240.

The control unit 240 controls general operations of the base station.For example, the control unit 240 transmits and receives signals throughthe wireless communication unit 210 or the backhaul communication unit220. Also, the control unit 240 records and reads data in and from thestorage unit 230. The control unit 240 may execute functions of aprotocol stack requested by a communication standard. According toanother embodiment, the protocol stack may be included in the wirelesscommunication unit 210. For doing so, the control unit 240 may includeat least one processor.

According to various embodiments, the control unit 240 may perform radioresource control (RRC) signaling with the terminal 120. For example, thecontrol unit 240 may control the base station to perform operationsaccording to various embodiments, to be described.

FIG. 3 illustrates a configuration of a terminal in a wirelesscommunication system according to various embodiments of the presentdisclosure. The configuration illustrated in FIG. 3 may be understood asthe configuration of the terminal 120. A term such as ‘portion’ or ‘˜er’ used hereafter indicates a unit for processing at least one functionor operation, and may be implemented using hardware, software, or acombination of hardware and software.

Referring to FIG. 3, the terminal 120 includes a communication unit 310,a storage unit 320, and a control unit 330.

The communication unit 310 may perform functions for transmitting andreceiving signals over a radio channel. For example, the communicationunit 310 performs a conversion function between a baseband signal and abit string according to a physical layer standard of the system. Forexample, in data transmission, the communication unit 310 generatescomplex symbols by encoding and modulating a transmit bit string. Also,in data reception, the communication unit 310 restores a receive bitstring by demodulating and decoding a baseband signal. Also, thecommunication unit 310 up-converts the baseband signal to an RF bandsignal, transmits it via an antenna, and down-converts an RF band signalreceived via the antenna to a baseband signal. For example, thecommunication unit 310 may include a transmit filter, a receive filter,an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.

Also, the communication unit 310 may include a plurality of transmit andreceive paths. Further, the communication unit 310 may include at leastone antenna array including a plurality of antenna elements. In view ofthe hardware, the wireless communication unit 310 may include a digitalcircuit and an analog circuit (e.g., an RF integrated circuit (RFIC)).Herein, the digital circuit and the analog circuit may be implemented asa single package. Also, the communication unit 310 may include aplurality of RF chains. Further, the communication unit 310 may performthe beamforming.

In addition, the communication unit 310 may include differentcommunication modules for processing signals of different frequencybands. Further, the communication unit 310 may include a plurality ofcommunication modules for supporting different radio accesstechnologies. For example, different radio access technologies mayinclude Bluetooth low energy (BLE), wireless fidelity (Wi-Fi), WiFiGigabyte (WiGig), and a cellular network (e.g., Long Term Evolution(LTE)). Also, different frequency bands may include a super highfrequency (SHF) (e.g., 2.5 GHz, 5 GHz) band and a millimeter weave(e.g., 60 GHz) band.

The communication unit 310 transmits and receives the signals as statedabove. Hence, whole or part of the communication unit 310 may bereferred to as ‘a transmitter’, ‘a receiver’, or ‘a transceiver’. Inaddition, the transmission and the reception over the radio channel areused as the meaning which embraces the above-stated processing of thecommunication unit 310 in the following explanations. In someembodiments, the communication unit 310 may perform functions fortransmitting and receiving a signal using wired communication.

The storage unit 320 stores a basic program for operating the terminal,an application program, and data such as setting information. Thestorage unit 320 may include a volatile memory, a non-volatile memory,or a combination of a volatile memory and a non-volatile memory. Thestorage unit 320 provides the stored data according to a request of thecontrol unit 330.

The control unit 330 controls general operations of the terminal. Forexample, the control unit 330 transmits and receives signals through thecommunication unit 310. Also, the control unit 330 records and readsdata in and from the storage unit 320. The control unit 330 may executefunctions of a protocol stack required by a communication standard. Fordoing so, the control unit 330 may include at least one processor ormicroprocessor, or may be part of a processor. In addition, part of thecommunication unit 310 and the control unit 330 may be referred to as acommunication processor (CP).

According to various embodiments, the control unit 330 may perform theRRC signaling a base station, determine a code rate based on an RRCconfiguration according to the RRC signaling, and determine a size ofdata using the code rate. For example, the control unit 330 may controlthe terminal to carry out operations to be explained according tovarious embodiments.

FIG. 4A through 4C illustrate a configuration of a communication unit ina wireless communication system according to various embodiments of thedisclosure. FIG. 4A through 4C depict an example of a detailedconfiguration of the wireless communication unit 210 of FIG. 2 or thecommunication unit 310 of FIG. 3. More specifically, FIG. 4A through 4Cdepict components for performing the beamforming, as part of thewireless communication unit 210 of FIG. 2 or the communication unit 310of FIG. 3.

Referring to FIG. 4A, the wireless communication unit 210 or thecommunication unit 310 includes an encoder and modulator 402, a digitalbeamformer 404, a plurality of transmit paths 406-1 through 406-N, andan analog beamformer 408.

The encoder and modulator 402 performs channel encoding. For the channelencoding, at least one of low density parity check (LDPC) code,convolution code, and polar code may be used. The encoder and modulator402 generates modulation symbols by performing constellation mapping.

The digital beamformer 404 beamforms a digital signal (e.g., themodulation symbols). For doing so, the digital beamformer 404 multipliesthe modulation symbols by beamforming weights. Herein, the beamformingweights are used to change an amplitude and a phase of the signal, andmay be referred to as a ‘precoding matrix’ or a ‘precoder’. The digitalbeamformer 404 outputs the digital-beamformed modulation symbols to thetransmit paths 406-1 through 406-N. In so doing, according to a multipleinput multiple output (MIMO) transmission scheme, the modulation symbolsmay be multiplexed or the same modulation symbols may be provided to thetransmit paths 406-1 through 406-N.

The transmit paths 406-1 through 406-N convert the digital-beamformeddigital signals to analog signals. For doing, the transmit paths 406-1through 406-N each may include an inverse fast Fourier transform (IFFT)operator, a cyclic prefix (CP) adder, a DAC, and an up-converter. The CPadder is used for an orthogonal frequency division multiplexing (OFDM)scheme, and may be excluded if another physical layer scheme (e.g.,filter bank multi-carrier (FBMC)) is applied. That is, the transmitpaths 406-1 through 406-N provide an independent signal process for aplurality of streams generated through the digital beamforming. Yet,depending on the implementation, some of the components of the transmitpaths 406-1 through 406-N may be used in common.

The analog beamformer 408 beamforms the analog signals. For doing so,the digital beamformer 404 multiplies the analog signals by thebeamforming weights. Herein, the beamforming weights are used to changethe amplitude and the phase of the signal. More specifically, the analogbeamformer 408 may be configured as shown in FIG. 4B or FIG. 4C,according to a connection structure between the transmit paths 406-1through 406-N and the antennas.

Referring to FIG. 4B, signals inputted to the analog beamformer 408 areconverted in phase/amplitude, amplified, and transmitted via theantennas. In so doing, the signal of each path is transmitted viadifferent antenna sets, that is, antenna arrays. A signal inputted in afirst path is converted by phase/amplitude converters 412-1-1 through412-1-M to a signal string having different or the same phase/amplitude,amplified by amplifiers 414-1-1 through 414-1-M, and then transmittedvia the antennas.

Referring to FIG. 4C, signals inputted to the analog beamformer 408 areconverted in phase/amplitude, amplified, and transmitted via antennas.In so doing, a signal of each path is transmitted via the same antennaset, that is, the same antenna array. A signal inputted in the firstpath is converted by the phase/magnitude converters 412-1-1 through412-1-M to a signal string having different or the same phase/amplitude,and amplified by the amplifiers 414-1-1 through 414-1-M. To transmit viaa single antenna array, the amplified signals are summed by adders416-1-1 through 416-1-M based on the antenna element, and thentransmitted via the antennas.

The independent antenna array is used per transmit path in FIG. 4B, andthe transmit paths share the single antenna array in FIG. 4C. However,according to another embodiment, some transmit paths may use theindependent antenna array, and the rest transmit paths may share oneantenna array. Further, according to yet another embodiment, by applyinga switchable structure between the transmit paths and the antennaarrays, a structure which adaptively changes according to a situationmay be used.

In the LTE system which is a representative example of a broadbandwireless communication system, downlink adopts the OFDM scheme anduplink adopts single carrier (SC)-frequency division multiple access(FDMA) scheme. The multiple access scheme as described abovedistinguishes data or control information for each user by allocatingand operating, so as not to overlap time-frequency resources fortransmitting the data or the control information for each user, that is,to establish orthogonality.

FIG. 5 illustrates a basic structure of a frequency-time domain which isa radio resource region for transmitting data or control information indownlink in an LTE system according to various embodiments of thepresent disclosure.

Referring to FIG. 5, a vertical axis indicates the time domain, and ahorizontal axis indicates the frequency domain. A minimum transmissionunit of the time domain is an OFDM symbol, Nsymb-ary OFDM symbols 502construct one slot 506, and two slots construct one subframe 505. Alength of the slot is 0.5 ms, and a length of the subframe is 1.0 ms. Aminimum transmission unit of the frequency domain is a subcarrier.

A basic unit of resources in the time-frequency domain is a resourceelement (RE) 512, which may be indicated as an OFDM symbol index and asubcarrier index. A resource block (RB) 508 or a physical resource block(PRB) is defined as Nsymb-ary consecutive OFDM symbols 502 in the timedomain and NRBSC-ary consecutive subcarriers 510 in the frequencydomain. Hence, one RB 508 includes Nsymb×NRBSC-ary REs 512. In general,a minimum transmission unit of data is the RB, and the systemtransmission band includes NRB-ary RBs in total. In addition, the entiresystem transmission band includes NRB×NRBSC-ary subcarriers 504 intotal. In the LTE system, Nsymb=7 and NRBSC=12 in general.

Control information is transmitted within first N-ary OFDM symbols ofthe subframe. A control channel transmission period N is N={1, 2, 3} ingeneral. Thus, the value N varies for each subframe according to anamount of the control information to transmit in a current subframe. Forexample, the control information may include an indicator indicating howmany OFDM symbols the control information is transmitted over,scheduling information of uplink or downlink data, hybrid automaticrepeat request (HARQ) acknowledgement (ACK)/negative ACK (NACK) signal,and so on.

The wireless communication system adopts the HARQ scheme whichretransmits corresponding data in a physical layer, if a decodingfailure occurs in an initial transmission. If a receiver fails tocorrectly decode data, the HARQ scheme allows the receiver to transmitinformation (e.g., NACK) notifying the decoding failure to thetransmitter so that the transmitter may retransmit corresponding data inthe physical layer. The receiver increases data reception performance bycombining the data retransmitted by the transmitter retransmits with theexisting data which is failed in decoding. In addition, if the receivercorrectly decodes the data, it may transmit information (e.g., ACK)indicating the decoding success so that transmitter may transmit newdata.

One of the most important things in the wireless communication system toprovide high-speed data service is to support a scalable bandwidth. Insome embodiments, the system transmission band of the LTE system mayhave various bandwidth such as 20/15/10/5/3/1.4 MHz. Hence, serviceproviders may provide services by selecting a specific bandwidth fromthe various bandwidths. In addition, a terminal (e.g., the terminal 120)may be of various types for supporting the bandwidth 20 MHz at maximumand supporting only the bandwidth 1.4 MHz at minimum.

In the wireless communication system, a base station (e.g., the basestation 110) informs the terminal of scheduling information of downlinkdata or uplink data through downlink control information (DCI). Theuplink means a radio link for a terminal to transmit data or a controlsignal to a base station, and the downlink means a radio link for a basestation to transmit data or a control signal to a terminal. By definingvarious formats, the DCI is operated by applying a set DCI formataccording to uplink data scheduling information (UL grant) or downlinkdata scheduling information (DL grant), compact DCI with a small controlinformation size, spatial multiplexing using multiple antennas, and DCIfor power control. For example, DCI format 1 which is the downlink datascheduling information (DL grant) may be configured to include thefollowing control information.

-   -   Resource allocation type 0/1 flag: Resource allocation type 0/1        flag notifies whether a resource allocation scheme is type 0 or        type 1. Type 0 flag allocates resources on a resource block        group (RBG) basis using a bitmap scheme. In the LTE system, a        basic scheduling unit is an RB expressed as time and frequency        domain resources, and the RBG includes a plurality of RBs to        become the basic scheduling unit for the type 0. Type 1 flag        allocates a specific RB in the RBG.    -   Resource block assignment: Resource block assignment notifies an        RB assigned for data transmission. The expressed resource is        determined according to the system bandwidth and the resource        allocation scheme.    -   MCS: MCS notifies a modulation scheme used for the data        transmission and a size of a transport block to be transmitted.    -   HARQ process number: HARQ process number notifies a process        number of the HARQ.    -   New data indicator: New data indicator notifies either HARQ        initial transmission or retransmission.    -   Redundancy version: Redundancy version notifies a redundancy        version (RV) of the HARQ.    -   Transmit power control (TPC) command for physical uplink control        channel (PUCCH): TPC command for a PUCCH notifies a power        control command for PUCCH which is an uplink control channel.

The DCI is channel-coded, modulated, and transmitted through a physicaldownlink control channel (PDCCH) which is a DL physical control channel.

In general, the DCI is channel-coded independently per terminal, andthen configured and transmitted as an independent PDCCH. The PDCCH inthe time domain is mapped and transmitted in a control channeltransmission interval. A mapping position of PDCCH in the frequencydomain is determined by an identifier (ID) of each terminal, anddispersed across the entire system transmission bandwidth.

Downlink data is transmitted over a physical downlink shared channel(PDSCH) which is a physical channel for transmitting downlink data. ThePDSCH is transmitted after the control channel transmission interval,and scheduling information such as a specific mapping position in thefrequency domain or the modulation scheme is notified by the DCItransmitted over the PDCCH.

The base station notifies the terminal of the modulation scheme appliedto the PDSCH to transmit and a data size (TBS) to transmit, through a5-bit MCS in the control information of the DCI. The TBS corresponds toa size of the data to be transmitted by the base station before thechannel coding for error correction is applied.

Typically, modulation schemes supported in the LTE include quadraturephase shift keying (QPSK), 16 quadrature amplitude modulation (QAM),64QAM, 256QAM, and so on.

FIG. 6 illustrates a modulation scheme usable in a wirelesscommunication system according to various embodiments of the presentdisclosure.

Referring to FIG. 6, the modulation scheme supported in the LTE systemcorresponds to QPSK, 16QAM, 64QAM, and 256QAM, and each corresponds to amodulation order (Qm)={2, 4, 6, 8}. That is, 2 bits may be transmittedper QPSK modulation symbol, 4 bits may be transmitted per 16QAMmodulation symbol, 6 bits may be transmitted per 64QAM modulationsymbol, and 8 bits may be transmitted per 256QAM modulation symbol. Inthe 256 QAM, the modulation order=8 and 8 bit may be transmitted for onemodulation symbol, and accordingly transmission efficiency is higherthan the 64 QAM over 33%. However, services supporting variousreliabilities are not considered in the LTE system. The 5G system whichis an advanced wireless communication system needs to define a methodfor generating and applying a CQI and MCS table suitable for theservices supporting various reliabilities.

In a cellar system, a base station (e.g., the base station 110) needs totransmit a reference signal to measure a DL channel status. For example,in the LTE-A system of 3GPP, a terminal (e.g., the terminal 120)measures a channel status between the base station and the terminalusing channel status information (CSI)-reference signal (RS) transmittedby the base station. The channel status needs to fundamentally considersome factors, wherein an interference amount in the DL is included. Theinterference amount in the DL includes an interference signal and athermal noise caused by an antenna of a neighboring base station, andmay be used for the terminal to determine a channel condition of the DL.For example, if a base station including one transmit antenna transmitsan RS to a terminal including one receive antenna, the terminaldetermines an energy per symbol to interference density ratio (Es/Io) bydetermining an energy per symbol receivable in the DL from the RSreceived from the base station and an interference amount concurrentlyreceived in the reception interval of the corresponding symbol. Thedetermined Es/Io is notified to the base station so that the basestation may determine a data transfer rate for transmission to theterminal in the DL.

FIG. 7 illustrates an example of one CQI transmission of channel statusinformation of a terminal according to a signal energy and aninterference level measured by the terminal according to variousembodiments of the present disclosure.

Referring to FIG. 7, a terminal (e.g., the terminal 120) performschannel estimation by measuring a DL RS such as CSI-RS, and calculatesthe Es (the received signal energy) according to a radio channel usingit as indicated by a solid line 700. In addition, the terminalcalculates intensities of interference and noise of a dotted line 710using a separate resource for measuring the DL RS or the interferenceand the noise. In the LTE, the base station assumes a signal measured ina corresponding radio resource as the interference and the noise byusing the CRS being the DL RS or by setting an interference measurementresource to the terminal to measure the interference and the noise. Theterminal determines and notifies to the base station a maximum datatransfer rate receivable with a specific success rate in its calculatedsignal to interference and noise ratio using the received signal energyand the interference and noise intensities acquired as above. The basestation notified with the maximum data transfer rate supportable by theterminal in the corresponding signal to interference and noise ratiodetermines an actual data transfer rate of the DL signal to transmit tothe terminal using it. As such, the maximum data transfer ratereceivable at the terminal with its specific success rate to the basestation is referred to as CQI in the LTE standard. In general, since theradio channel varies based on time, the terminal notifies the CQI to thebase station periodically or the base station notifies it to theterminal at a request. The request from the base station to the terminalmay be performed using one or more of the periodic method and theaperiodic method.

The modulation scheme supported in the 5G system includes QPSK, 16QAM,64QAM, and 256QAM. A different CQI table and a different MCS table maybe used by a maximum modulation order supported by the terminal. A tablewhere the maximum modulation order is 64QAM among CQI tables currentlyused in the LTE system, maintaining a uniform SNR gap between entries ofthe CQI table, efficiently enables the terminal to select a CQI formaximizing transmission efficiency and notify it to the base station.However, a table where the maximum modulation order is 256QAM has awider SNR gap between entries corresponding to a low SNR among entriesof the CQI table than an SNR gap of other entries. In this regard,various embodiments of the present disclosure suggest a method forgenerating a new CQI table instead of the CQI table in which themaximum-order modulation scheme used in the LTE is 256QAM. A method forgenerating and applying a CQI table according to various embodiments ofthe present disclosure is as follows.

-   -   CQI information amount is maintained at 4 bits as in the prior        art to prevent an signaling overhead.    -   CQI index 0 is maintained as out of range.    -   CQI index 1 uses the same entry as the CQI index 1 of the table        in which the maximum modulation order is 64QAM. Thus, the same        coverage may be obtained between two different tables.    -   The modulation scheme of CQI index 15 is 256QAM, and its code        rate is 972/1024. Herein, the code rate 972/1024 is the code        rate of approximately 0.95.    -   Entries from CQI indexes 2 to 14 may be arranged to have a        uniform SNR gap at maximum. For doing so, one available method        is as follows. The terminal calculates bit-interleaved coding        and modulation (BICM) capacity for the CQI index 1, and        calculates BICM capacity for the CQI index 15. Next, the        terminal divides a gap between the two values into 14 intervals.        In so doing, assuming the same RE number, since CQI indexes of        small indexes correspond to a relatively small information word,        the gap between the CQI indexes of the small indexes may be set        to be relatively wider than a gap of other CQI indexes. In some        embodiments, the BICM capacity value set per CQI index is shown        in Table 1 (the CQI table used if the maximum modulation order        is 256QAM). Herein, the BICM capacity is a value rounded off to        the nearest hundredths.    -   An optimal combination of the modulation scheme and the code        rate per CQI index is found by referring to a BICM capacity        curve. In some embodiments, combinations of the modulation        scheme and the code rate are shown in Table 1.

TABLE 1 CQI index modulation code rate × 1024 BICM capacity [dB] 0 outof range 1 QPSK 78 −9.5 2 QPSK 140 −6.8 3 QPSK 241 −4.1 4 QPSK 389 −1.55 QPSK 576 1 6  16QAM 398 3.4 7  16QAM 544 5.8 8  16QAM 698 8.2 9  64QAM571 10.6 10  64QAM 697 13 11  64QAM 818 15.4 12 256QAM 706 17.8 13256QAM 807 20.2 14 256QAM 900 22.6 15 256QAM 972 24.9

In some embodiments, the terminal performs one or more of the followingoperations if using entry values corresponding to two successive indexesof the entries of the CQI table of Table 1.

-   -   The terminal reports the CQI index #1 to the base station if the        BLER with the code rate of 78/1024 and the modulation order of        QPSK is lower than a target.    -   The terminal reports the CQI index #2 to the base station if the        BLER with the code rate of 78/1024 and the modulation order of        QPSK is higher than the target and the BLER with the code rate        of 140/1024 and the modulation order of QPSK is lower than the        target.    -   The terminal reports the CQI index #3 to the base station if the        BLER with the code rate of 140/1024 and the modulation order of        QPSK is higher than the target and the BLER with the code rate        of 241/1024 and the modulation order of QPSK is lower than the        target.    -   The terminal reports the CQI index #4 to the base station if the        BLER with the code rate of 241/1024 and the modulation order of        QPSK is higher than the target and the BLER with the code rate        of 389/1024 and the modulation order of QPSK is lower than the        target.    -   The terminal reports the CQI index #5 to the base station if the        BLER with the code rate of 389/1024 and the modulation order of        QPSK is higher than the target and the BLER with the code rate        of 576/1024 and the modulation order of QPSK is lower than the        target.    -   The terminal reports the CQI index #6 to the base station if the        BLER with the code rate of 576/1024 and the modulation order of        QPSK is higher than the target and the BLER with the code rate        of 398/1024 and the modulation order of 16QAM is lower than the        target.    -   The terminal reports the CQI index #7 to the base station if the        BLER with the code rate of 398/1024 and the modulation order of        16QAM is higher than the target and the BLER with the code rate        of 544/1024 and the modulation order of 16QAM is lower than the        target.    -   The terminal reports the CQI index #8 to the base station if the        BLER with the code rate of 544/1024 and the modulation order of        16QAM is higher than the target and the BLER with the code rate        of 698/1024 and the modulation order of 16QAM is lower than the        target.    -   The terminal reports the CQI index #9 to the base station if the        BLER with the code rate of 698/1024 and the modulation order of        16QAM is higher than the target and the BLER with the code rate        of 571/1024 and the modulation order of 64QAM is lower than the        target.    -   The terminal reports the CQI index #10 to the base station if        the BLER with the code rate of 571/1024 and the modulation order        of 64QAM is higher than the target and the BLER with the code        rate of 697/1024 and the modulation order of 64QAM is lower than        the target.    -   The terminal reports the CQI index #11 to the base station if        the BLER with the code rate of 697/1024 and the modulation order        of 64QAM is higher than the target and the BLER with the code        rate of 818/1024 and the modulation order of 64QAM is lower than        the target.    -   The terminal reports the CQI index #12 to the base station if        the BLER with the code rate of 818/1024 and the modulation order        of 64QAM is higher than the target and the BLER with the code        rate of 706/1024 and the modulation order of 256QAM is lower        than the target.    -   The terminal reports the CQI index #13 to the base station if        the BLER with the code rate of 706/1024 and the modulation order        of 256QAM is higher than the target and the BLER with the code        rate of 807/1024 and the modulation order of 256QAM is lower        than the target.    -   The terminal reports the CQI index #14 to the base station if        the BLER with the code rate of 807/1024 and the modulation order        of 256QAM is higher than the target and the BLER with the code        rate of 900/1024 and the modulation order of 256QAM is lower        than the target.    -   The terminal reports the CQI index #15 to the base station if        the BLER with the code rate of 900/1024 and the modulation order        of 256QAM is higher than the target and the BLER with the code        rate of 972/1024 and the modulation order of 256QAM is lower        than the target.

A method for generating and applying a CQI table according to otherembodiments of the present disclosure is as follows.

-   -   The CQI information amount is maintained at 4 bits as in the        prior art to prevent the signaling overhead.    -   The CQI index 0 is maintained as out of range.    -   The CQI index 1 uses the same entry as the CQI index 1 of the        table in which the maximum modulation order is 64QAM. Thus, the        same coverage may be obtained between two different tables.    -   The modulation scheme of the CQI index 15 is 256QAM, and its        code rate is 960/1024. Herein, the code rate 960/1024 is the        code rate of approximately 0.9375.    -   Entries from the CQI indexes 2 to 14 may be arranged to have the        uniform SNR gap at maximum. For doing so, one available method        is as follows. The terminal calculates the BICM capacity for the        CQI index 1, and calculates BICM capacity for the CQI index 15.        Next, the terminal divides a gap between the two values into 14        intervals. In so doing, assuming the same RE number, since CQI        indexes of small indexes correspond to a relatively small        information word, the gap between the CQI indexes of the small        indexes may be set to be relatively wider than the gap of other        CQI indexes. In some embodiments, the BICM capacity value set        per CQI index is shown in Table 2 (the CQI table used if the        maximum modulation order is 256QAM). Herein, the BICM capacity        is a value rounded off to the nearest hundredths.    -   An optimal combination of the modulation scheme and the code        rate per CQI index is found by referring to the BICM capacity        curve. In some embodiments, combinations of the modulation        scheme and the code rate are shown in Table 2

TABLE 2 CQI index modulation code rate × 1024 BICM capacity [dB] 0 outof range 1 QPSK 78 −9.5 2 QPSK 134 −7.0 3 QPSK 223 −4.5 4 QPSK 357 −2.05 QPSK 528 0.4 6  16QAM 364 2.8 7  16QAM 506 5.2 8  16QAM 660 7.6 9 64QAM 540 10.0 10  64QAM 665 12.4 11  64QAM 788 14.8 12 256QAM 680 17.213 256QAM 782 19.6 14 256QAM 878 22.0 15 256QAM 960 24.4

In some embodiments, the terminal performs one or more of the followingoperations if using entry values corresponding to two consecutiveindexes of the entries of the CQI table of Table 2.

-   -   The terminal reports the CQI index #1 to the base station if the        BLER with the code rate of 78/1024 and the modulation order of        QPSK is lower than the target.    -   The terminal reports the CQI index #2 to the base station if the        BLER with the code rate of 78/1024 and the modulation order of        QPSK is higher than the target and the BLER with the code rate        of 134/1024 and the modulation order of QPSK is lower than the        target.    -   The terminal reports the CQI index #3 to the base station if the        BLER with the code rate of 134/1024 and the modulation order of        QPSK is higher than the target and the BLER with the code rate        of 223/1024 and the modulation order of QPSK is lower than the        target.    -   The terminal reports the CQI index #4 to the base station if the        BLER with the code rate of 223/1024 and the modulation order of        QPSK is higher than the target and the BLER with the code rate        of 357/1024 and the modulation order of QPSK is lower than the        target.    -   The terminal reports the CQI index #5 to the base station if the        BLER with the code rate of 357/1024 and the modulation order of        QPSK is higher than the target and the BLER with the code rate        of 528/1024 and the modulation order of QPSK is lower than the        target.    -   The terminal reports the CQI index #6 to the base station if the        BLER with the code rate of 528/1024 and the modulation order of        QPSK is higher than the target and the BLER with the code rate        of 364/1024 and the modulation order of 16QAM is lower than the        target.    -   The terminal reports the CQI index #7 to the base station if the        BLER with the code rate of 364/1024 and the modulation order of        16QAM is higher than the target and the BLER with the code rate        of 506/1024 and the modulation order of 16QAM is lower than the        target.    -   The terminal reports the CQI index #8 to the base station if the        BLER with the code rate of 506/1024 and the modulation order of        16QAM is higher than the target and the BLER with the code rate        of 660/1024 and the modulation order of 16QAM is lower than the        target.    -   The terminal reports the CQI index #9 to the base station if the        BLER with the code rate of 660/1024 and the modulation order of        16QAM is higher than the target and the BLER with the code rate        of 540/1024 and the modulation order of 64QAM is lower than the        target.    -   The terminal reports the CQI index #10 to the base station if        the BLER with the code rate of 540/1024 and the modulation order        of 64QAM is higher than the target and the BLER with the code        rate of 665/1024 and the modulation order of 64QAM is lower than        the target.    -   The terminal reports the CQI index #11 to the base station if        the BLER with the code rate of 665/1024 and the modulation order        of 64QAM is higher than the target and the BLER with the code        rate of 788/1024 and the modulation order of 64QAM is lower than        the target.    -   The terminal reports the CQI index #12 to the base station if        the BLER with the code rate of 788/1024 and the modulation order        of 64QAM is higher than the target and the BLER with the code        rate of 680/1024 and the modulation order of 256QAM is lower        than the target.    -   The terminal reports the CQI index #13 to the base station if        the BLER with the code rate of 680/1024 and the modulation order        of 256QAM is higher than the target and the BLER with the code        rate of 782/1024 and the modulation order of 256QAM is lower        than the target.    -   The terminal reports the CQI index #14 to the base station if        the BLER with the code rate of 782/1024 and the modulation order        of 256QAM is higher than the target and the BLER with the code        rate of 878/1024 and the modulation order of 256QAM is lower        than the target.    -   The terminal reports the CQI index #15 to the base station if        the BLER with the code rate of 878/1024 and the modulation order        of 256QAM is higher than the target and the BLER with the code        rate of 960/1024 and the modulation order of 256QAM is lower        than the target.

Herein, the BLER value may mean an error occurrence probability afterdecoding of the received transport block is completed. In someembodiments, the terminal may decode a number of transport blocks andthen determine the BLER value through an adequate calculation, but theBLER value may be generally determined through the received SNR. Hence,the terminal may predict whether the decoding is successful by measuringonly the received SNR without performing the actual decoding and reportthe CQI index to the base station.

Meanwhile, a different reliability may be required according to theservice type supported in the 5G system, and a different CQI table maybe used according to the required reliability. In some embodiments, aneMBB scenario operates to target for BLER 0.1 in the 5G, but a URLLCscenario may operate to target for BLER 10A-5. In addition, among theeMBB or URLLC scenario, there may be a scenario operating to target fortwo or more different BLERs or received SNRs. For example, a URLLCscenario #1 may operate to target for BLER 10A-3 and a URLLC scenario #2may operate to target for BLER 10A-5.

The terminal may notify the base station of CSI including an intendedscenario to be serviced or the required reliability or its correspondingor related information. In addition, the base station may notify ascenario currently applied to the terminal through RRC configuration.The used CQI table or the entry values per CQI index may be changed bythe set scenario or the required reliability or its corresponding orrelated information.

Hence, an embodiment of the present disclosure provides a method forgenerating and applying a CQI table to apply a different scenario. Ifthere are two more scenarios having different target BLERs (or thereceived SNR or its corresponding or related information) to supportwith the same maximum modulation order, two or more different CQI tablescorresponding to their target BLER (or the received SNR or itscorresponding or related information) may be used. In so doing, aplurality of entries of all of entries of one or more CQI tables of thetotal CQI table may have a specified relation with entries having thesame CQI index among entries of other CQI table. For example, aplurality of entries selected may have the same modulation order in twoor more CQI tables. In another example, a plurality of entries selectedmay have the code rate which differs by a preset value in two or moreCQI tables. Herein, the code rate is not an effective code rate, but maybe a representative value of the code rate or a nominal code rate. Thenominal code rate may be expressed with a decimal between 0 and 1 asexpressed in the code rate, but may be expressed with a numerator valueif a denominator is a square of 2 such as 1024. For example, if the coderate is 0.5 and the denominator is 1024, it may be expressed as 512.This code rate is a code rate designated in the signaling, and may notprecisely match this code rate in actual decoding because of additionaloverhead. Hereafter, to facilitate descriptions, the target BLER or thereceived SNR or its corresponding or related information may be referredto as the target BLER.

That is, the terminal may determine the modulation scheme and the coderate using a specific CQI table, and then adjust and use the code rateby a preset value according to the scenario defined in its intendedtarget BLER or RRC configuration.

An example of the CQI table found in some embodiments is shown in Table3 through Table 7 (the CQI tables used if the maximum modulation orderis 256QAM). The CQI tables in Table 3 through Table 7 are CQI tableshaving the same maximum modulation order which is 256QAM but usable in ascenario having different BLER targets. The terminal may determine ofwhich table entry values are used through the RRC configuration. Thedifferent CQI tables shown in Table 3 through Table 7 have the samemodulation order between entries having the same CQI index, and 1024times the code rate differs by 12, 24, 36, or 48.

TABLE 3 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 78 0.1523 2 QPSK 140 0.2734 3 QPSK 241 0.4707 4 QPSK 389 0.7598 5QPSK 576 1.1250 6  16QAM 398 1.5547 7  16QAM 544 2.125 8  16QAM 6982.7266 9  64QAM 571 3.3457 10  64QAM 697 4.0840 11  64QAM 818 4.7930 12256QAM 706 5.5156 13 256QAM 807 6.3047 14 256QAM 900 7.0313 15 256QAM972 7.5938

TABLE 4 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 66 0.1289 2 QPSK 128 0.2500 3 QPSK 229 0.4473 4 QPSK 377 0.7363 5QPSK 564 1.1016 6  16QAM 386 1.5078 7  16QAM 532 2.0781 8  16QAM 6862.6797 9  64QAM 559 3.2754 10  64QAM 685 4.0137 11  64QAM 806 4.7227 12256QAM 694 5.4219 13 256QAM 795 6.2109 14 256QAM 888 6.9375 15 256QAM960 7.5000

TABLE 5 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 54 0.1055 2 QPSK 116 0.2266 3 QPSK 217 0.4238 4 QPSK 365 0.7129 5QPSK 552 1.0781 6  16QAM 374 1.4609 7  16QAM 520 2.0313 8  16QAM 6742.6328 9  64QAM 547 3.2051 10  64QAM 673 3.9434 11  64QAM 794 4.6523 12256QAM 682 5.3281 13 256QAM 783 6.1172 14 256QAM 876 6.8438 15 256QAM948 7.4063

TABLE 6 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 42 0.0820 2 QPSK 104 0.2031 3 QPSK 205 0.4004 4 QPSK 353 0.6895 5QPSK 540 1.0547 6  16QAM 362 1.4141 7  16QAM 508 1.9844 8  16QAM 6622.5859 9  64QAM 535 3.1348 10  64QAM 661 3.8730 11  64QAM 782 4.5820 12256QAM 670 5.2344 13 256QAM 771 6.0234 14 256QAM 864 6.7500 15 256QAM936 7.3125

TABLE 7 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 30 0.0586 2 QPSK 92 0.1797 3 QPSK 193 0.3770 4 QPSK 341 0.6660 5QPSK 528 1.0313 6  16QAM 350 1.3672 7  16QAM 496 1.9375 8  16QAM 6502.5391 9  64QAM 523 3.0645 10  64QAM 649 3.8027 11  64QAM 770 4.5117 12256QAM 658 5.1406 13 256QAM 759 5.9297 14 256QAM 852 6.6563 15 256QAM924 7.2188

In the above embodiments, the entries of the CQI table having a specificrelation with an entry of other CQI table are not representedseparately, and may be represented with a relation with the entry of theother CQI table which is a reference. For example, in the aboveembodiment, a plurality of entries selected from two different tables beexpressed with the identical modulation order, and the code rate whichdiffers by 12, 24, 36, or 48.

In some embodiments, the CQI table found may be shown in Table 8 throughTable 12 (the CQI tables used if the maximum modulation order is256QAM). The CQI tables in Table 8 through Table 12 are CQI tableshaving the same maximum modulation order which is 256QAM but usable in ascenario having different target BLERs. The terminal may determine ofwhich table entry values are used through the RRC configuration. Thedifferent CQI tables shown in Table 8 through Table 12 have the samemodulation order between entries having the same CQI index, and 1024times the code rate differs by 12, 24, 36, or 48.

TABLE 8 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 78 0.1523 2 QPSK 134 0.2617 3 QPSK 223 0.4355 4 QPSK 357 0.6973 5QPSK 528 1.0313 6  16QAM 364 1.4219 7  16QAM 506 1.9766 8  16QAM 6602.5781 9  64QAM 540 3.1641 10  64QAM 665 3.8965 11  64QAM 788 4.6172 12256QAM 680 5.3125 13 256QAM 782 6.1094 14 256QAM 878 6.8594 15 256QAM960 7.5000

TABLE 9 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 66 0.1289 2 QPSK 122 0.2383 3 QPSK 211 0.4121 4 QPSK 345 0.6738 5QPSK 516 1.0078 6  16QAM 352 1.375 7  16QAM 494 1.9297 8  16QAM 6482.5313 9  64QAM 528 3.0938 10  64QAM 653 3.8262 11  64QAM 776 4.5469 12256QAM 668 5.2188 13 256QAM 770 6.0156 14 256QAM 866 6.7656 15 256QAM948 7.4063

TABLE 10 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 54 0.1055 2 QPSK 110 0.2148 3 QPSK 199 0.3887 4 QPSK 333 0.6504 5QPSK 504 0.9844 6  16QAM 340 1.3281 7  16QAM 482 1.8828 8  16QAM 6362.4844 9  64QAM 516 3.0234 10  64QAM 641 3.7559 11  64QAM 764 4.4766 12256QAM 656 5.125 13 256QAM 758 5.9219 14 256QAM 854 6.6719 15 256QAM 9367.3125

TABLE 11 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 42 0.0820 2 QPSK 104 0.2031 3 QPSK 205 0.4004 4 QPSK 353 0.6895 5QPSK 540 1.0547 6  16QAM 362 1.4141 7  16QAM 508 1.9844 8  16QAM 6622.5859 9  64QAM 535 3.1348 10  64QAM 661 3.8730 11  64QAM 782 4.5820 12256QAM 670 5.2344 13 256QAM 771 6.0234 14 256QAM 864 6.7500 15 256QAM936 7.3125

TABLE 12 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 42 0.082 2 QPSK 98 0.1914 3 QPSK 187 0.3652 4 QPSK 321 0.627 5QPSK 492 0.9609 6  16QAM 328 1.2813 7  16QAM 470 1.8359 8  16QAM 6242.4375 9  64QAM 504 2.9531 10  64QAM 629 3.6855 11  64QAM 752 4.4063 12256QAM 644 5.0313 13 256QAM 746 5.8281 14 256QAM 842 6.5781 15 256QAM924 7.2188

In the above embodiments, the entries of the CQI table having a specificrelation with an entry of other CQI table are not representedseparately, and may be represented with a relation with the entry of theother CQI table which is a reference. In some embodiments, a pluralityof entries selected from two different tables may be expressed with theidentical modulation order, and the code rate which differs by 12, 24,36, or 48.

In some embodiments, the CQI table may be defined as shown in Table 13through Table 17 (the CQI tables used if the maximum modulation order is64QAM). The CQI tables in Table 13 through Table 17 are CQI tableshaving the same maximum modulation order which is 64QAM but usable in ascenario having different BLER targets. The terminal may determine ofwhich table entry values are used through the RRC configuration. Theterminal may determine of which table entry values are used through aCSI report of the terminal. The different CQI tables shown in Table 13through Table 17 have a relation that the same modulation order betweenentries having the same CQI index, and the code rate differs by 12, 24,36, or 48.

TABLE 13 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 78 0.1523 2 QPSK 120 0.2344 3 QPSK 193 0.377 4 QPSK 308 0.6016 5QPSK 449 0.877 6 QPSK 602 1.1758 7 16QAM 378 1.4766 8 16QAM 490 1.9141 916QAM 616 2.4063 10 64QAM 466 2.7305 11 64QAM 567 3.3223 12 64QAM 6663.9023 13 64QAM 772 4.5234 14 64QAM 873 5.1152 15 64QAM 948 5.5547

TABLE 14 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 66 0.1289 2 QPSK 108 0.2109 3 QPSK 181 0.3535 4 QPSK 296 0.5781 5QPSK 437 0.8535 6 QPSK 590 1.1523 7 16QAM 366 1.4297 8 16QAM 478 1.86729 16QAM 604 2.3594 10 64QAM 454 2.6602 11 64QAM 555 3.252 12 64QAM 6543.832 13 64QAM 760 4.4531 14 64QAM 861 5.0449 15 64QAM 936 5.4844

TABLE 15 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 54 0.1055 2 QPSK 96 0.1875 3 QPSK 169 0.3301 4 QPSK 284 0.5547 5QPSK 425 0.8301 6 QPSK 578 1.1289 7 16QAM 354 1.3828 8 16QAM 466 1.82039 16QAM 592 2.3125 10 64QAM 442 2.5898 11 64QAM 543 3.1816 12 64QAM 6423.7617 13 64QAM 748 4.3828 14 64QAM 849 4.9746 15 64QAM 924 5.4141

TABLE 16 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 42 0.082 2 QPSK 84 0.1641 3 QPSK 157 0.3066 4 QPSK 272 0.5313 5QPSK 413 0.8066 6 QPSK 566 1.1055 7 16QAM 342 1.3359 8 16QAM 454 1.77349 16QAM 580 2.2656 10 64QAM 430 2.5195 11 64QAM 531 3.1113 12 64QAM 6303.6914 13 64QAM 736 4.3125 14 64QAM 837 4.9043 15 64QAM 912 5.3438

TABLE 17 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 30 0.0586 2 QPSK 72 0.1406 3 QPSK 145 0.2832 4 QPSK 260 0.5078 5QPSK 401 0.7832 6 QPSK 554 1.082 7 16QAM 330 1.2891 8 16QAM 442 1.7266 916QAM 568 2.2188 10 64QAM 418 2.4492 11 64QAM 519 3.041 12 64QAM 6183.6211 13 64QAM 724 4.2422 14 64QAM 825 4.834 15 64QAM 900 5.2734

In the above embodiments, entries of a CQI table having a specificrelation with an entry of other CQI table are not representedseparately, and may be represented with a relation with the entry of theother CQI table which is a reference. In the above embodiments, themodulation order is identical, and the code rate differs by 12, 24, 36,or 48.

As another embodiment of the method for generating the CQI table toapply different scenarios, a plurality of entries of the entire entriesof one or more CQI tables among the whole CQI tables may use a pluralityof entries of entries of other CQI table by changing only the CQI index.Alternatively, the modulation order may be maintained and only the coderate may be changed by a set value. Other entries may be set to have themodulation order and the code rate having a specific frequencyefficiency between spectral efficiencies of two adjacent differententries. As an example for defining the modulation order and the coderate having the specific frequency efficiency, there may be a method fordetermining the modulation order and the code rate having a requiredintermediate SNR by referring to the BICM capacity.

The CQI table generated in such a manner may be defined as shown inTable 18 through Table 22 (the CQIs table used if the maximum modulationorder is 16QAM). The CQI tables shown in Table 18 through Table 22 isCQI tables usable in a scenario having the identical maximum modulationorder of 16QAM but different BLER targets. The terminal may determine ofwhich table entry values are applied through the RRC configuration. Thedifferent CQI tables shown in Table 18 through Table 22 have the samemodulation order between entries having the same CQI index, and the coderate differs by a multiple of 12. In addition, the CQI tables shown inTable 18 through Table 22 use eight CQI index entries in the CQI tablesas shown in Table 3 through Table 7, or change only the code rate by 12,24, 36, or 48.

TABLE 18 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 78 0.1523 2 QPSK 105 0.2051 3 QPSK 140 0.2734 4 QPSK 184 0.3594 5QPSK 241 0.4707 6 QPSK 309 0.6035 7 QPSK 389 0.7598 8 QPSK 482 0.9414 9QPSK 576 1.1250 10 QPSK 673 1.3145 11 16QAM 398 1.5547 12 16QAM 4691.8320 13 16QAM 544 2.1250 14 16QAM 621 2.4258 15 16QAM 698 2.7266

TABLE 19 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 66 0.1289 2 QPSK 93 0.1816 3 QPSK 128 0.2500 4 QPSK 172 0.3359 5QPSK 229 0.4473 6 QPSK 297 0.5801 7 QPSK 377 0.7363 8 QPSK 470 0.9180 9QPSK 564 1.1016 10 QPSK 320 1.2500 11 16QAM 386 1.5078 12 16QAM 4571.7852 13 16QAM 532 2.0781 14 16QAM 609 2.3789 15 16QAM 686 2.6797

TABLE 20 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 54 0.1055 2 QPSK 81 0.1582 3 QPSK 116 0.2266 4 QPSK 160 0.3125 5QPSK 217 0.4238 6 QPSK 285 0.5566 7 QPSK 365 0.7129 8 QPSK 458 0.8945 9QPSK 552 1.0781 10 QPSK 308 1.2031 11 16QAM 374 1.4609 12 16QAM 4451.7383 13 16QAM 520 2.0313 14 16QAM 597 2.3320 15 16QAM 674 2.6328

TABLE 21 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 42 0.0820 2 QPSK 69 0.1348 3 QPSK 104 0.2031 4 QPSK 148 0.2891 5QPSK 205 0.4004 6 QPSK 273 0.5332 7 QPSK 353 0.6895 8 QPSK 446 0.8711 9QPSK 540 1.0547 10 QPSK 296 1.1563 11 16QAM 362 1.4141 12 16QAM 4331.6914 13 16QAM 508 1.9844 14 16QAM 585 2.2852 15 16QAM 662 2.5859

TABLE 22 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 30 0.0586 2 QPSK 57 0.1113 3 QPSK 92 0.1797 4 QPSK 136 0.2656 5QPSK 193 0.3770 6 QPSK 261 0.5098 7 QPSK 341 0.6660 8 QPSK 434 0.8477 9QPSK 528 1.0313 10 QPSK 284 1.1094 11 16QAM 350 1.3672 12 16QAM 4211.6445 13 16QAM 496 1.9375 14 16QAM 573 2.2383 15 16QAM 650 2.5391

In some embodiments, the CQI table may be defined as shown in Table 23through Table 27 (the CQI tables used if the maximum modulation order is16QAM). The CQI tables in Table 23 through Table 27 are CQI tablesusable in a scenario having the identical maximum modulation order of16QAM but different BLER targets. The terminal may determine of whichtable entry values are applied through the RRC configuration. Thedifferent CQI tables in Table 23 through Table 27 have the samemodulation order between entries having the same CQI index, and the coderate differs by a multiple of 12. In addition, the CQI tables in Table23 through Table 27 use eight CQI index entries in the CQI tables ofTable 8 through Table 12, or change only the code rate by 12, 24, 36, or48.

TABLE 23 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 78 0.1523 2 QPSK 102 0.1992 3 QPSK 134 0.2617 4 QPSK 173 0.3379 5QPSK 223 0.4355 6 QPSK 284 0.5547 7 QPSK 357 0.6973 8 QPSK 438 0.8555 9QPSK 528 1.0313 10 QPSK 624 1.2188 11 16QAM 364 1.4219 12 16QAM 4331.6914 13 16QAM 506 1.9766 14 16QAM 583 2.2773 15 16QAM 660 2.5781

TABLE 24 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 66 0.1289 2 QPSK 90 0.1758 3 QPSK 122 0.2383 4 QPSK 161 0.3145 5QPSK 211 0.4121 6 QPSK 272 0.5313 7 QPSK 345 0.6738 8 QPSK 426 0.832 9QPSK 516 1.0078 10 QPSK 612 1.1953 11 16QAM 352 1.375 12 16QAM 4211.6445 13 16QAM 494 1.9297 14 16QAM 571 2.2305 15 16QAM 648 2.5313

TABLE 25 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 54 0.1055 2 QPSK 78 0.1523 3 QPSK 110 0.2148 4 QPSK 149 0.291 5QPSK 199 0.3887 6 QPSK 260 0.5078 7 QPSK 333 0.6504 8 QPSK 414 0.8086 9QPSK 504 0.9844 10 QPSK 600 1.1719 11 16QAM 340 1.3281 12 16QAM 4091.5977 13 16QAM 482 1.8828 14 16QAM 559 2.1836 15 16QAM 636 2.4844

TABLE 26 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 42 0.082 2 QPSK 66 0.1289 3 QPSK 98 0.1914 4 QPSK 137 0.2676 5QPSK 187 0.3652 6 QPSK 248 0.4844 7 QPSK 321 0.627 8 QPSK 402 0.7852 9QPSK 492 0.9609 10 QPSK 588 1.1484 11 16QAM 328 1.2813 12 16QAM 3971.5508 13 16QAM 470 1.8359 14 16QAM 547 2.1367 15 16QAM 624 2.4375

TABLE 27 CQI index modulation code rate × 1024 efficiency 0 out of range1 QPSK 30 0.0586 2 QPSK 54 0.1055 3 QPSK 86 0.168 4 QPSK 125 0.2441 5QPSK 175 0.3418 6 QPSK 236 0.4609 7 QPSK 309 0.6035 8 QPSK 390 0.7617 9QPSK 480 0.9375 10 QPSK 576 1.125 11 16QAM 316 1.2344 12 16QAM 3851.5039 13 16QAM 458 1.7891 14 16QAM 535 2.0898 15 16QAM 612 2.3906

Herein, some entry having a high CQI index in a new CQI tableadditionally generated may be replaced with a reserved field.

Alternatively, some entries in the new CQI table may be allocated to ahigher CQI index by a specific CQI index, and a remaining low CQI indexmay be newly configured to have the modulation order and the code ratehaving a lower spectral efficiency.

The CQI table generated in such a manner may be defined as shown inTable 28. This is a CQI table using entries corresponding to nine CQIindexes as they are in the existing CQI table. Other six entries may beset as reserved or filled with entries for supporting a lower spectralefficiency.

TABLE 28 CQI index modulation code rate × 1024 efficiency 0 out of range— — — — — — — — — — — — — QPSK 78 0.1523 — QPSK 120 0.2344 — QPSK 1930.3770 — QPSK 308 0.6016 — QPSK 449 0.8770 — QPSK 602 1.1758 — 16QAM 3781.4766 — 16QAM 490 1.9141 — 16QAM 616 2.4063 — — — — — — — — — — — —

In various embodiments of the present disclosure, other modulationscheme than QPSK, 16QAM, 64QAM, and 256QAM may be applied to the CQItable. For example, a pi/2-BPSK modulation scheme or 1024QAM may befurther included.

The MCS may be designed and used similarly to the CQI. Notably, sincethe MCS, which uses more signaling bits, may have more entries of thetable than the CQI. In addition, whole or part of the modulation orderand the code rate defined in the CQI table may be reused in the MCStable.

The TBS may be calculated using a code rate known in the MCS. In someembodiments, the TBS may be determined by the number of the allocatedREs, the number of the used layers, a transmission order, the code rate,and so on. The transmission order and the code rate of various factorswhich determine the TBS may be obtained through the MCS of the signalinginformation. In some embodiments, the modulation order obtained throughthe MCS may be used as it is and the code rate obtained through the MCSmay be additionally adjusted according to the RRC configurationinformation. In some embodiments, if only an MCS table for a service ofa high target BLER is defined and is set to support a service having theidentical maximum modulation order through the RRS signaling but the lowtarget BLER, a transceiver may obtain the modulation order and the coderate from the defined MCS table, and adjust and use only the code rate.A method for adjusting the code rate may adopt various methods. Amongthem, for example, a method for subtracting a preset constant value fromthe code rate may be used. In so doing, the constant value subtractedfrom the code rate may use the same value for every CQI index, or use avalue varying according to the modulation order. In some embodiments,the code rate may be defined based on Equation 1.R=f(R′,P)  Equation 1

Herein, R may denote the code rate applied for the TBS calculation, R′may denote the code rate obtained from the existing table, and P maydenote a service scenario or service mode related parameter obtained bythe RRC configuration.

In other embodiments, the code rate may be defined as Equation 2.R=f(R′,P)=R′−a(P)  Equation 2

Herein, R may denote the code rate applied for the TBS calculation, R′may denote the code rate obtained from the existing table, P may denotethe service scenario or service mode related parameter obtained by theRRC configuration, and a(P) may denote a constant value determinedaccording to the service scenario or mode related parameter P. That is,Equation 1 may be expressed as R=R′-a for a predefined constant a, andthe constant a may use an identical value regardless of the servicescenario or mode but may achieve optimized performance by using adifferent value, for example, 12/1024, 24/1024, 36/1024, or 48/1024.Herein, the service scenario or mode may be defined on various bases,and may be changed according to various system requirements such as auser category, the target BLER, or the modulation order. In addition,the service scenario or mode may be determined on multiple bases incombination.

Only subtracting the specific constant value based on the code rate hasbeen described in Equation 1, but it may be implemented in variousmethods. For example, the method may be implemented by setting areference denominator value for indicating the code rate to 1024,invoking the code rate*1024 value from each CQEI or MCS table, andsubtracting a particular integer constant from the value as in the CQIor MCS table according to various embodiments of the present disclosure.As an example of the method described in Equation 1, if the constantsuch as 12 or 24 or 36 or 46 is subtracted from the value R*1024corresponding to an adequate code rate R, the same effect as subtracting12/1024, 24/1024, 36/1024, or 48/1024 in Equation 1 may be achieved. Assuch, the application based on the code rate as expressed in Equation 1has various methods for obtaining the same effect. In some embodiments,various embodiments of the present disclosure may be implemented bysetting an adequate value corresponding to the code rate and thenreadjusting the adequate value corresponding to the code rate using itsadequate constant value.

In some embodiments, various embodiments of the present disclosure basedon Equation 1 may be implemented by designing a plurality of CQI or MCStables as mentioned earlier. For example, in a wireless communicationsystem applying a plurality of CQI or MCS tables, if the code ratecorresponding to the same index or its corresponding values in the twoCQI or MCS tables are set to exhibit a difference by a preset value, thesame effect as the various embodiments of the present disclosure basedon Equation 1 may be achieved.

FIG. 8 illustrates a flowchart of a terminal for calculating a TBS usinga CQI and MCS table according to various embodiments of the presentdisclosure. FIG. 8 illustrates an operating method of the terminal 120.

Referring to FIG. 8 a base station (e.g., the base station 110) signalsRRC to the terminal by considering a service to be provided to theterminal. In step 801, the terminal performs RRC configuration. In step803, the terminal obtains a code rate and a transmission order which area reference. In step 805, the terminal adjusts the code rate if aservice defined in the RRC configuration is different from a referenceservice. A specific method for acquiring the code rate and thetransmission order, and a method for adjusting the code rate conform tovarious embodiments of the present disclosure. The terminal calculates aTBS using the adjusted code rate in step 807.

FIG. 9 illustrates another flowchart of a terminal for calculating a TBSusing a CQI and MCS table according to various embodiments of thepresent disclosure. FIG. 9 illustrates an operating method of theterminal 120.

Referring to FIG. 9, a base station (e.g., the base station 110) signalsRRC to the terminal by considering a service to be provided to theterminal. In step 901, the terminal performs RRC configuration. In step903, the terminal obtains a code rate and a transmission order which area reference. In step 905, the terminal adjusts the code rate if aservice defined in the RRC configuration is different from a referenceservice. A specific method for acquiring the code rate and thetransmission order, and a method for adjusting the code rate conform tovarious embodiments of the present disclosure. In step 907, the terminalfeeds back a channel status using the adjusted code rate.

In some embodiments, the base station 110 and the terminal 120 maycommunicate using at least one of wireless communication and wiredcommunication.

The methods according to the embodiments described in the claims or thespecification of the disclosure may be implemented in software,hardware, or a combination of hardware and software.

As for the software, a computer-readable storage medium storing one ormore programs (software modules) may be provided. One or more programsstored in the computer-readable storage medium may be configured forexecution by one or more processors of an electronic device. One or moreprograms may include instructions for controlling the electronic deviceto execute the methods according to the embodiments described in theclaims or the specification of the disclosure.

Such a program (software module, software) may be stored to a randomaccess memory, a non-volatile memory including a flash memory, a readonly memory (ROM), an electrically erasable programmable ROM (EEPROM), amagnetic disc storage device, a compact disc (CD)-ROM, digital versatilediscs (DVDs) or other optical storage devices, and a magnetic cassette.Alternatively, it may be stored to a memory combining part or all ofthose recording media. A plurality of memories may be included.

The program may be stored in an attachable storage device accessible viaa communication network such as Internet, Intranet, local area network(LAN), wide LAN (WLAN), or storage area network (SAN), or acommunication network by combining these networks. Such a storage devicemay access a device which executes an embodiment of the presentdisclosure through an external port. In addition, a separate storagedevice on the communication network may access the device which executesan embodiment of the present disclosure.

In the specific embodiments of the disclosure, the elements included inthe disclosure are expressed in a singular or plural form. However, thesingular or plural expression is appropriately selected according to aproposed situation for the convenience of explanation, the disclosure isnot limited to a single element or a plurality of elements, the elementsexpressed in the plural form may be configured as a single element, andthe elements expressed in the singular form may be configured as aplurality of elements.

Meanwhile, while the specific embodiment has been described in theexplanations of the present disclosure, it will be noted that variouschanges may be made therein without departing from the scope of thedisclosure. Thus, the scope of the disclosure is not limited and definedby the described embodiment and is defined not only the scope of theclaims as below but also their equivalents.

The invention claimed is:
 1. A method performed by a user equipment (UE)in a wireless communication system, the method comprising: receiving,from a base station (BS), configuration information for indicating oneof a plurality of channel quality indicator (CQI) tables via a radioresource control (RRC) signaling, wherein the plurality of CQI tablesincludes: a first CQI table for a first block error rate (BLER), 0.1,and a second CQI table for a second BLER, 0.00001, identifying a CQIindex from the second CQI table in case that the configurationinformation indicates the second CQI table; and transmitting, to the BS,the identified CQI index, wherein a first CQI index of the first CQItable indicates a combination of a first modulation scheme and a firstcode rate, wherein a second CQI index of the second CQI table indicatesthe combination of the first modulation scheme and the first code rate,and wherein the first CQI index is lower than the second CQI index. 2.The method of claim 1, wherein the first CQI table includes a pluralityof combinations, wherein the second CQI table includes the plurality ofcombinations, and wherein the plurality of combinations includes a firstcombination expressed as (quadrature phase shift keying (QPSK),78/1024), a second combination expressed as (QPSK, 120/1024), a thirdcombination expressed as (QPSK, 193/1024), a fourth combinationexpressed as (QPSK, 308/1024), a fifth combination expressed as (QPSK,449/1024), a sixth combination expressed as (QPSK, 602/1024) a seventhcombination expressed as (16-QAM, quadrature amplitude modulations,378/1024), an eighth combination expressed as (16-QAM, 490/1024), andninth combination expressed as (16-QAM, 616/1024).
 3. The method ofclaim 2, wherein a first CQI index of the first CQI table indicates acombination among the plurality of combinations, wherein a second CQIindex of the second CQI table indicates the combination among theplurality of combinations, and wherein a value of the first CQI index islower than a value of the second CQI index.
 4. The method of claim 1,further comprising, in case that the one of the plurality of CQI tablesis the second CQI table, receiving, from the BS, a transport block withan error probability not exceeding the second BLER.
 5. The method ofclaim 1, wherein the second CQI table is configured to include a lowerspectral efficiency than the first CQI table in a same index.
 6. A userequipment (UE) in a wireless communication system, comprising: at leastone transceiver; and at least one processor operably coupled to the atleast one transceiver, wherein the at least one processor is configuredto: receive, from a base station (BS), configuration information forindicating one of a plurality of channel quality indicator (CQI) tablesvia a radio resource control (RRC) signaling, wherein the plurality ofCQI tables includes: a first CQI table for a first block error rate(BLER), 0.1, and a second CQI table for a second BLER, 0.00001, identifya CQI index from the second CQI table in case that the configurationinformation indicates the second CQI table, and transmit, to the BS, theidentified CQI index, wherein a first CQI index of the first CQI tableindicates a combination of a first modulation scheme and a first coderate, wherein a second CQI index of the second CQI table indicates thecombination of the first modulation scheme and the first code rate, andwherein the first CQI index is lower than the second CQI index.
 7. TheUE of claim 6, wherein the first CQI table includes a plurality ofcombinations, wherein the second CQI table includes the plurality ofcombinations, and wherein the plurality of combinations includes a firstcombination expressed as (quadrature phase shift keying (QPSK),78/1024), a second combination expressed as (QPSK, 120/1024), a thirdcombination expressed as (QPSK, 193/1024), a fourth combinationexpressed as (QPSK, 308/1024), a fifth combination expressed as (QPSK,449/1024), a sixth combination expressed as (QPSK, 602/1024) a seventhcombination expressed as (16-QAM, quadrature amplitude modulations,378/1024), an eighth combination expressed as (16-QAM, 490/1024), andninth combination expressed as (16-QAM, 616/1024).
 8. The UE of claim 7,wherein a first CQI index of the first CQI table indicates a combinationamong the plurality of combinations, wherein a second CQI index of thesecond CQI table indicates the combination among the plurality ofcombinations, and wherein a value of the first CQI index is lower than avalue of the second CQI index.
 9. The UE of claim 6, wherein the atleast one processor is configured to, in case that the one of theplurality of CQI tables is the second CQI table, receive, from the BS, atransport block with an error probability not exceeding the second BLER.10. The UE of claim 6, wherein the second CQI table is configured toincludes a lower spectral efficiency than the first CQI table in a sameindex.
 11. A method performed by a base station (BS) in a wirelesscommunication system, the method comprising: transmitting, to a userequipment (UE) configuration information for indicating one of aplurality of channel quality indicator (CQI) tables via a radio resourcecontrol (RRC) signaling, wherein the plurality of CQI tables includes: afirst CQI table for a first block error rate (BLER), 0.1, and a secondCQI table for a second BLER, 0.00001; and receiving, from the UE, a CQIindex, wherein a first CQI index of the first CQI table indicates acombination of a first modulation scheme and a first code rate, whereina second CQI index of the second CQI tables indicates the combination ofthe first modulation scheme and the first code rate, and wherein thefirst CQI index is lower than the second CQI index.
 12. The method ofclaim 11, wherein the first CQI table includes a plurality ofcombinations, wherein the second CQI table includes the plurality ofcombinations, and wherein the plurality of combinations includes a firstcombination expressed as (quadrature phase shift keying (QPSK),78/1024), a second combination expressed as (QPSK, 120/1024), a thirdcombination expressed as (QPSK, 193/1024), a fourth combinationexpressed as (QPSK, 308/1024), a fifth combination expressed as (QPSK,449/1024), a sixth combination expressed as (QPSK, 602/1024) an eighthcombination expressed as (16-QAM, 490/1024), and a ninth combinationexpressed as (16-QAM, 616/1024).
 13. The method of claim 12, wherein thefirst CQI index of the first CQI table indicates a combination among theplurality of combinations, wherein a second CQI index of the second CQItable indicates the combination among the plurality of combinations, andwherein a value of the first CQI index is lower than a value of thesecond CQI index.
 14. The method of claim 11, further comprising, incase that the one of the plurality of CQI tables is the second CQItable, transmitting, to the UE, a transport block with an errorprobability not exceeding the second BLER.
 15. A base station (BS) in awireless communication system, the BS comprising: at least onetransceiver; and at least one processor operably coupled to the at leastone transceiver, wherein the at least one processor is configured to:transmit, to a user equipment (UE) configuration information forindicating one of a plurality of channel quality indicator (CQI) tablesvia a radio resource control (RRC) signaling, wherein the plurality ofCQI tables includes: a first CQI table for a first block error rate(BLER), 0.1, and a second CQI table for a second BLER, 0.00001; andreceive, from the UE, a CQI index, wherein a first CQI index of thefirst CQI table indicates a combination of a first modulation scheme anda first code rate, wherein a second CQI index of the second CQI tablesindicates the combination of the first modulation scheme and the firstcode rate, and wherein the first CQI index is lower than the second CQIindex.
 16. The BS of claim 15, wherein the first CQI table includes aplurality of combinations, wherein the second CQI table includes theplurality of combinations, and wherein the plurality of combinationsincludes a first combination expressed as (quadrature phase shift keying(QPSK), 78/1024), a second combination expressed as (QPSK, 120/1024), athird combination expressed as (QPSK, 193/1024), a fourth combinationexpressed as (QPSK, 308/1024), a fifth combination expressed as (QPSK,449/1024), a sixth combination expressed as (QPSK, 602/1024), an eighthcombination expressed as (16-QAM, 490/1024), and a ninth combinationexpressed as (16-QAM, 616/1024).
 17. The BS of claim 16, wherein thefirst CQI index of the first CQI table indicates a combination among theplurality of combinations, wherein a second CQI index of the second CQItable indicates the combination among the plurality of combinations, andwherein a value of the first CQI index is lower than a value of thesecond CQI index.
 18. The BS of claim 15, wherein the at least oneprocessor is configured to, in case that the one of the plurality of CQItables is the second CQI table, transmit, to the UE, a transport blockwith an error probability not exceeding the second BLER.